Memory device



June 17, 1952 A. M. KRUEGl-:R ET AL MEMORY DEVICE 9 Sheets-Sheet l Filed Jan. 24, 1948 NEM June 17, 952

Filed Jan. 24, 1948 A. M. KRUEGER ET AL 2,501,154

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MEMORY DEVICE 9 Sheets-Sheet '7 Filed Jan. 24, 1948 June 17, 1952 A. M. KRUEGER ET Ax. 2,601,154

MEMORY DEVICE Filed Jan. 24, 1948 9 Sheets-Sheet 8 f/ /DMM' IN VEN TOR.

June 17, 1952 A. M. KRUEGER ET AL 2,601,154

MEMORY DEVICE Filed Jan. 24, 1948 9 sheets-sheet 9 1219.24 K JMU fea M/o Razr Pimm Patented June 17, 1952 MEMORY DEVICE Alfred M. Krueger, Brooklyn, N. Y., and Rolf H.

Peterson, Bergeniield, N. J., assignors to Peterson & Krueger, Inc., New York, N. Y., a corporation of New York Application January 24, 1948, Serial No. 4,184

28 Claims.

This invention relates to devices of the type variously known as preselector devices, memory devices, control storage means, and the like, and which, essentially, embody means for designating selecting signals, means for recording such signals in reproducible form at the time they are put in, and means for taking off signals based on the aforesaid signals at predetermined or desired later times. Such devices have a wide variety of applications, among which radio control apparatus and record players come particularly to mind, but which include such widely diverse fields as vending machines, games, and sequence-controls for machinery.

A considerable number of types of such apparatus have been proposed for use and a few of these are actually in operation; but their general use has been held back by various deficiencies, and their application to many of the fields which are open to them has been prevented by various lacks in the conceptions on which they are based.

Among the features which are important in machines of the type under consideration are wide flexibility of operation; ease and speed in the putting in and taking out of signals; the ability to put in signals while signals are being taken out; the ability to record a single input impulse in a pattern for selective output control; and the provision for a maximum of delay, when desired, between operations of the input and takeoff means.

With the foregoing and other considerations in view, the present invention contemplates the provision of a device which will embody as many as possible of such features and which will have such qualities to a maximum extent. -In various of its more specific aspects, the invention contemplates the provision of a device embodying all of the foregoing features in a high degree; the provision of effective means for clearing a record impression from the recording means at a suitable stage after the take-off of the impression; the provision of means for recording a series of signals in individual or pattern form; the provision of means for taking off of the members of the series in the same order as received; the provision of improved electro-mechanical means for putting in and taking off the signals; the provision of an electro-mechanical means to control the intervals between taking off of successive ones of the series; the provision of means having a storage capacity of an entirely different order from any previously known; and the provision of various greatly improved features of construction and operation.

The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts, which will be exemplied in the constructions hereinafter set forth and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:

Figure 1 is a cross-sectional View of one form of selector means embodying the invention;

Fig. 2 is a fragmentary sectional View along the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary sectional view along the line 3 3 of Fig. 1;

Fig. 4 is an enlarged fragmentary view illustrating the pins in detail;

Fig. 5 is a fragmentary sectional view along the line 5 5 of Fig. 3; g

Fig. 6 is a view similar to Fig. 4 showing an alternative form of pins;

Fig. '7 is a view of a radio set adapted to be 'Y controlled by and having a panel adapted for use in the actuation of selector means embodying the invention;

Fig. 8 is a diagram of one form of wiring arrangement and connections embodying the invention as applied to a radio such as illustrated in Fig. 7;

Fig. 9 is a similar View of electrical wiring and connections for use in the playing of records;

Fig. 10 is a view similar to Fig. 1 showing a modication;

Fig. 1l is a horizontal sectional view of another modiiied form of memory device construction;

Fig. 12 is a vertical section along the line I2-|2 of Fig. 11;

Fig. 13 is a fragmentary top view of the device of Figs. 1l and 12;

Fig. 14 is a fragmentary horizontal section along the line lll-I4 of Fig. 12;

Fig. 15 is a schematic View of the pin arrangement;

Fig. 16 is a fragmentary showing of a circuit arrangement adaptable for use with the modification of Figs. 11-15;

Fig. 17 shows a modified form of pin-receiving hole;

Fig. 18 is a vertical sectional view of another modification;

Fig. 19 is a horizontal sectional View on the line |9--I9 of Fig. 18;

Fig. 'is an enlarged detail view of a portion thereof along the line '2G-2S of Fig. 18;

Fig. 21 is a fragmentary vertical sectional view of still another modification;

Fig. 22 is a fragmentary horizontal sectional view along the lines E2- 22 oi Fig. 21;

Fig. 23 is a fragmentary horizontal sectional view along the lines 2,3-23 of Fig. 2l

Fig. 2i is a diagrammatic view indicating the circuit arrangement used in the modification of Figs. 21-23; and

Fig. 25 is a partly sectional detail view along lines 25-25 of Fig. 23.

In the form of construction shown in Fig. 1 there is provided a frame Il! to which a vertical shaft II is Xedly secured. Rotatably mounted on the lower part of the shaft I I is a supporting arm I2 carrying a plurality of solenoids I4 having upwardly movable plungers I5. Eight solenoids designated respectively as I4a, Ih, I4c, Ifid, Ille, 54j, I4g, and Iliz are provided in the present instance. Above the supporting arm I2 is an indeXing arm I8 which is rotatably mounted on the shaft II independentlv of the arm I2. Above the arm I 8 is a memory unit 2? rotatably mounted on the shaft lI and is freely movable with respect to the arms l2 and I3. It is composed of a pair of disks 2I and 22 and a hub portion 25, the whole being united by rivets 28. The disks are formed with alined rows 24 of holes 25. Each pair of holes contains a pin which, as exemplied, is composed of two spring arms converging at their bottom at 32 and having upper inward bends 38 and lower inward bends 31 either of which will grip the sides of the hole in the disk 22 in which n the pin fits. When the upper inward bends 35 are alined with the disk 22, an upward movement of the pins against the resiliency of their spring arms will bring the lower indentations 3'! in alinement with the disk 22; and a later downward movement or" pins will reverse this action. Thus each pin may occupy either o1 two vertical positions and may be moved from one position to the other simply, easily, and effectively. In each row 24 there are provided in the present instance eight pins 50 so arranged that the pins of any row may be alined with the plungers I5 of the solenoids The pins in a row from the outermost to the innermost are designated as 36a, 3817, 35o Sd, 35e, Sf, 3Go, and 3071. upper portion of the frame I5 are a plurality of switches 39a, 39h, 35e, 39d, Sile, 35j, 35g, and 39h carrying downwardly-extending contact wiper arms lli of such length that they will contact a pin 3% which is in an uppermost position, but

not a pin 3S which is in a lowermost position. In the present instance the switches are so arranged that their wipers will be aline-:l with the pins 35 of any row which may e brought into position. Any pin 3Q which is raised will engage a wiper 4.2] and close the contact of switch 39.

The arm l2 carries near its outer end a solenoid 42 having a plunger 43 adapted to bear against the outer end of the arm I8. The periphery of the disk 2i is shaped in the form of a ratchet by the provision of saw-tooth notches 45, and there is pivoted at 45 on the arm I2 a pawl 4I held against the periphery of the disk 2I by aspring 48. Pivoted on the arm I8 at 49 is a pawl 50. A spring 5I serves to pull the pawl 50 against the notched periphery of the disk 2 I, and at the same time to draw the pawl and the arm I8 toward the end of the plunger 13. A pin 53 acts as a stop for such movement, and a pin 54 serves to positively prevent the pawl from being moved On an,

4 outwardly until the plunger 43 moves the arm I8 and the pawl in a countercloclnvise direction (Figs. 2 and 3) relative to the disk 2i. Clockwise movement of the unit 25 with respect to the arm i2 is thus eifectiveiY prevented.

Gn the underside of the upper portion of the fra-me IG there is mounted solenoid 55 adapted when energized to draw in a plunger 5S which is connected by a link Il to an arm 58 which is rotatably mounted on the shaft I I. The periphery of the disk 22 is notched as at and there is pivoted at on the underside or" the upper portion of the frame l?. a pawl 5l' which is normally held in place by a spring 68. Pivotally mounted at 65 on the arm 58 is a pawl l0, and a spring "II serves to normally hold this pawl in place and to draw the arm away from the solenoid 55, a stop pin 'i3 being provided to limit this movement. A pin 'i4 serves to hold the pawl IG in place and prevent any move-ment of the unit 20 until the arm 53 and the pawl Ill are moved in acounterclockwise direction (Figs. 2 and 3).

As will be seen from 5 the arn 58 has an inclined lower surface 'I5 which extends into the path of relative movement of the arm and of those pins 38 which are in an upward position, so that relative movement or" the arm 53 and the unit 28 under the influence of the solenoid 55 and the pawl 'le will result in restoring to their normal lower position whatever pins 30 have been moved to an upper position in any row.

Upon the energization Of selected ones of the solenoids I4 (e. g. solenoids I4b, I4d, and I4e) the plungers I5 thereof will be lifted and will lift corresponding pins in that row 24 which is directly above the plungers (e. g. 30D, 35d, and 30e). At the completion of the incoming signal the selected solenoids I4 are de-energized and the solenoid 42 is energized to cause a stepping or indexing of the unit 20 with respect to the arm I2. This results from the movement of the plunger 43 against the arm I8 in a direction which will stretch the spring 5I. The arm IB is moved enough to carry the pawl 50 in a counterclockwise direction (Fig. 2) from one notch to the next. During this action the supporting arm I2 is prevented from moving in a clockwise direction relative to the disk 2l by the holding pawl 41. When the solenoid 42 is deenergized, the spring 5I pulls the arm I 2 and the arm I8 together until stop 53 contacts the arm I8. During this action the pawl 4l ratchets to the next notch 45. The pin 54 now serves to hold the pawl 50 in place and to lock the arm I2 and the disk 2I together. This completes an index cycle of the arm I 2, and the selector means is ready to receive another coded signal or pattern of signals. These can be put in until the arm I2 has rotated thru 340 with respect to the frame I0 in the present instance; or, at any time after a row of pins has been positioned.

Signals may be taken 01T either after or simultaneously with the putting in of signals and until all the signals which have been put in are taken orf. In the taking off of signals the Wiper contact arms 40 serve to operate the switches 39 wherever there are pins 30 in an upper position. After a signal has been picked oiT and sent out, the taking off of the next signal is initiated by the energization of solenoid 55 to move the arm 58 in a counterclockwise position (Fig. 3) to index the pawl I0 one notch against the pull of the spring II to move the arm 58 in a new position with respect to the disk 22.

During this action, disk is prevented from following the arm 58 by the holding pawl 61 which is pivoted at 65 on frame I0. When the solenoid 55 is de-energized, the spring 1| pulls the arm 58 back to the stop pin 13, thus indexing the disk 22 (and the disk 2|) in a clockwise direction. Pin 14 on frame I0 holds pawl 10 in a notch 6'5 of disk 22 thereby locking the relative position of disk 22 and frame I0. The unit 20 being locked to the arm l2 at this stage, the arm I2 likewise moves one step in a clockwise direction with the movement of the arm 58. This may be repeated as often as desired as long as settings have been imparted to a suflicient number of rows 24 of the pins 30.

A wide variety of constructional changes may, of course, be made. For example, the pins may be formed as shown in Fig. 6, wherein the parts are indicated by similar reference numerals distinguished by the subscript k. The pin k here illustrated contains not only inward bends 36k and 31k adapted to mate with the upper disk 22k, but also inward bends 16 and 11 adapted to mate with the lower disk 2|k, thus giving a particularly effective holding action.

A selector means or memory device of the general character described above may be utilized in a wide number of applications including radio program selectors, phono-record selectors, television program selectors, power substation controls, sequence controls for automatic machinery, sequence controls for process machinery, fully automatic record playing stations for subscribers, calculating machines, computers, message dispatchers, code scramblers, 2.

vending machines, games of skill, stock market boards, telephone switchboards, railroad freight siding memories, textile machines, etc.

Figs. 7 and 8 show one form of actuation and control means for a standard radio console or cabinet as arranged for use in connection with the device of Figs. 1-5.

On a radio cabinet |00 there is provided a radio dial I0 l, a dial knob |02, a Shortwave or television push-button |93, and a phonograph button ||3. Station buttons ||4 are provided. A selector switch |4| has six positions, namely Offj On, Clean Automatid Manual, and DiaL The Off position shuts the set off. The On position energizes the equipment. position automatically clears signals recorded upon the memory unit 20. The Automatic position places the set under the control of the memory unit 20. The Manual position places the set under the control of the operator for pushbutton control. The Dial position permits the manual dialing of the various stations. Time limit buttons |42 for programs lasting an hour, |43 for programs lasting a half-hour, and |44 for programs lasting ve minutes are provided. When the selector switch 4| is turned to Automatic the unit 20 will be shifted every fteen minutes unless one of the buttons |42, |43, or |44 are pressed. The exempliiied circuits include a relay |45 having holding contacts |46 and |41 and a stroke contact |48. There are provided relays |50, |5|, and |52 having contacts |53, |54, and |55, respectively, adapted to energize a relay |56 having contacts |51 and |58 adapted to energize an indicating light |59. A clock |60 is provided with contact |6|, a clock cam having a contact |66, and stepper switch |61 having an arm |08. A stroke contact |69 is provided to energize a relay |10 having contacts |1| and |12 and a holding contact |13. 4Solenoid The Clear 55 is dependent upon contact |12 and operates stroke contact |59 and a stroke contact |14 as indicated in Fig. 3. Associated with the stepper switch |91 is a release coil |11. A five-minute cam |18 has a contact |19. Selector switch contacts I 84-|83 and 2|4 are provided for automatic operation, and the contacts ||92 and 201 for manual operation. Contacts |94, |95, and |96 are provided for the automatic clearing operation. A limit switch having contacts |91 and |98, the latter controlling an indicating light |99, is provided on the frame l0 as indicated in Figs. Zand 7, for operation by the arm l2. A limit switch having contacts 200 and 20|, the latter controlling a light 202, are provided on the frame |0 as indicated in Figs. 2 and '1, for operation by the arm l2. A relay 203 with contacts 204 and 205 is provided for transferring the selected oircuit from a radio channel to a television or shortwave channel. For automatic phonograph operation switch 39a energizes a relay 209 having contacts2|9,2||,and2|2.

From switch 39j an open lead 230, a common lead 23|, and a closed lead 232 run. From a switch 39g an open lead 234, a common lead 235, run. From switch 39h an open lead 231, and a closed lead 239 run. For the sake of simplicity in the drawings these leads are discontinuous being broken at the upper1 left hand portion of Fig. 8 and are resumed in the lower left hand corner oi Fig. 8. A jumper 240 connects the lever arm of switch 39h with the closed contact of switch 39g.

Assuming that the selector switch is in the Automatic position and clock |69 has its cont-act |5| closed, the operation for the program preselection is as follows:

For an hour program the hour button |42 is depressed and then a station is selected by operating any button H4. For a half-hour program the half-hour button |43 is depressed and then a station is selected by operating button I4. For a five-minute program the iive-minute button |44 is depressed and then a station is selected by operating any button ||4. For a fteen minute program a station push button ||4 is momentarily depressed. Since the fifteenminute program is the basis of the control circuit, this system willvbe described rst.

Pressing any station button ||4 energizes a particular combination of solenoids |4 of the selector means. Button 4 also energizes relay |45 closing its contacts |46 and |41, energizing solenoid 42 of the selector means. As the plunger 43 of solenoid 42 completes its stroke, it operates the stroke contact |48 to open and break the circuit thru contact |45 and contact |41 to solenoid 42. Solenoid 42 remains energized until any button |4 is released. The closing of the abovementioned circuit also permits the momentary depressing of any button ||4. This energizes relay |45 which is held energized thru its holding contact |46 and stroke contact |48 and simultaneously energizing solenoid 42 thru relay |45 contact |41. As the plunger 43 of solenoid 42 completes its stroke it operates the stroke contact |48 to open and break the circuit thereby de-energizng solenoid 42 and relay |45 and indexing takes place as described above.

The circuit is now ready for selection of the next station, and pressing of any push button station 4 will repeat the cycle as previously described, until the solenoid arm |2 rotates 360 in which position it operates the limit switch 200 to open and the limit switch 20| to close. When switch 200 opens, it prevent-s any further input signals to be recorded; while, when switch 20| closes, it energizes an indicating light 202 which indicates that memory unit 20 has been completely filled with preselected programs. It should be noted that the 350 rotation is not a limiting condition but is indicated only to show means for preventing the input of any further signals while the memory unit 20 is filled with selected programs. The invention in its broader aspects contemplates the provision of a wide number of continuous and non-continuous and repeating and non-repeating selector means or memory devices depending upon the needs of particular cases.

In the present instance, when a one-hour program is selected, button |42 is depressed before the station is selected, energizing solenoid |471l of the selector means the plunger of which strikes pin 307i of the row which is alined with l the solenoids. Similarly for a half-hour program, push button |43 is depressed before the station is selected, energizing solenoid |4g of the selector means, which strikes pin 30g. Similarly for a five-minute program, push button |44 is depressed before the station is selected, energizing solenoid |4f of the memory device, the plunger of which strikes pin 3M.

Successive ones of a series of signals put in as described above may be taken off in the manner described below.

Assuming that switches 39h, 30C, and 39d are closed by contact with the disk pins which correspond to them, relays |50, |5|, and |52 are energized, closing their respective contacts |53, |54,

and |55. rThe closing of these contacts energizes relay |56 which turns on a pretuned radio circuit for a particular station or operates a tuning selector mechanism. Contacts |51 and |58 of relay |56 also close, energizing indicating light |59 and connecting the speaker into the radio circuit.

At the next fifteen-minute interval the clock cam |65 closes its contact |66, energizing the stepper switch |61 which moves its arm |68 to the next contact position "3 of the stepper switch |61. Cam |65 operates once every fifteen minutes. When arm |63 moves to position 3, it energizes solenoid 55 of the memory device. As the plunger 56 of solenoid 55 starts its stroke it closes its stroke contact |14 and as the plunger 56 of solenoid 55 completes its stroke, it operates contact |69 to close, energizinz relay |10. Relay closes its contact |1| and |13 and opens its contact |12. The opening of contact |12 deenergizes solenoid 55 and indexing of the memory disk takes place as described above. The closing of contact |13 holds relay |10 in the energized position thereby preventing the stepper switch |61 from being operated while the closing of contact |1|I energizes the release coil |11 of the stepper switch |61. Operation of the release coil |11 results in arm |68 returning to its "Off (1"`) position. When solenoid 55 is deenergized its plunger 56 returns to its normal position thereby opening its stroke contacts |69 and |14. The opening of contact |14 de-energizes relay |16 which opens its contacts |13 and I1! thereby de-energizing the release coil |11. The

closing of contact |12 energizes stepper switch |61 so that it steps to the next position "2 thereby setting the circuit for the next timing cycle. For a one-hour program following a previous one (say the fifteen-minute program described above) the indexing operation is as follows:

Switch 39h of the memory device is closed by its corresponding pin h, while the station selection is made by switches 39D, 39o, and 39d and corresponding pins, as described previously. Switch 3971, closes its contact with lead 231 and opens its contact with lead 239 transferring the fifteen-minute interval circuit to the one-hour interval circuit which operates as follows: The previous closing of contact |12 had operated the stepper switch |61 and had moved its arm |66 to contact position 2. At the beginning of each iifteen minute interval cam |65 operates its contact |66 to close. Cam |65 then will hold contact |66 closed for a certain length of time, namely,

- six, ten, or twelve minutes depending upon the design and construction of cam |65 and after this time interval the cam |65 will permit switch |66 to open. The cycle is repeated once every fifteen minutes. The purpose for holding contact |66 closed for a certain length of time is to permit the automatic transferring from a five minute program to a fifteen minute, a half-hour or one hour program without the selector mechanism loosing a time interval. For example: Since a radio program usually begins on the hour, half hour, or quarter hour, it can be readily seen that a five-minute program will use up ve minutes of any other one-quarter hour, half-hour or onehour program which begins at the same time as the five minute program. At the end of the fiveminute program the indexing mechanism operates and steps the memory unit to the next selected program. In so indexing, the stepper switch |61 returns its arm |68 to the Off 1 position and the five-minute switch unit transfers the circuit from the rive-minute cam |18 to the quarter-hour cam |65. Now, since cam |65 holds contact |66 closed for a definite period of time (which must be greater than five minutes), the stepper switch |61 is energized to move its arm |68 to the 2 position thereby setting up the correct timing cycle for the next preselected program. At the following fifteen-minute interval cam contact |66 closes, operating stepper switch |61 thereby moving arm |68 to the next "3 position. After a certain time cam contact |66 opens. At the second fifteen-minute period, cam contact |66 closes operating stepper switch 61, moving arm 68 to the next "4 position. After a certain time, cam contact |66 opens. At the third fifteen-minute interval cam contact |66 closes and the cycle described above repeats moving arm |68 to the next 5 position. Cam contact |66 opens at a certain interval of time. At the fourth fifteen-minute interval cam contact 66 closes, repeating the cycle described above, moving arm |68 to the next 6 position. This position is the one hour position. When arm |68 moves to 6 position, solenoid 55 of the memory device is energized. As the plunger 56 of solenoid completes its stroke, it operates contact |69 to close which starts the indexing cycle of memory unit 20 as previously described. Similarly, relay |10 is energized closing its contacts |1| and |13 which starts the return of arm |68, first to the Ofi (1) position, and then to "2 position, thereby setting the circuit for the next time interval. For a half hour program, the operation of the indexing and timing circuits is the same as described for the one-hour program except that switch 39g is operated by its corresponding pin and contact 4 of the stepper switch |61 mechanism is the position employed to start operation of the indexing mechanism. For a live-minute program, the operation of the in- 9, dexing circuits is the same as described for the one-hour program except that switch 391 is operated by its corresponding pin. Switch 39], by closing its contact with lead 230, transfers the timing circuits from the fifteen-minute cam |65 to the rive-minute cam |18. Cam |18 closes its contact |19 once every ve minutes thereby operating the stepper switch |61 in five minute intervals. Contact 3 of the stepper switch |61 mechanism is the position employed to start operation of the indexing mechanism. it should be noted that operation of the timing circuits is not limited to a stepper switch mechanism but may be a combination of relays or other electro-mechanical mechanisms. Also by varying the timing components and adding additional pins to the memory device any program may be preselected for any length of time, i. e., two, four, ten hours, etc. For Manual operation the selector switch I4| in Fig. 7 is placed in the Manual position. It should be noted that when the selector switch |4| is in the Automatic position it operates upon a latching bar on the pushbuttons |'|4 in such a manner as to make these buttons of the momentary contact type, while in the Manual position the latching bar operates to make push buttons I I4 of the maintained contact type so that operation of any button II4 releases the previously operated button. This mechanism thereby permits the usage of the same push buttons ||4 for either Manual or Automatic operation. When in the Manual position, the selectorswitch contacts |84 to |88, inclusive, and 2 I4 open, while contacts |89 to |92, inclusive, and 201 close, isolating the memory device signal-input mechanism from the circuit and transferring the control of relays |59, I| and |52 directly to the pushbuttons II4. Operation of relays |50, |5|, and |52 select the radio station desired as previously explained. timing circuits and indexing mechanism of disk unit 20 of the memory device continue to remain under the control of cams |65 and |18 because the selector switch |4I contact |83 closes thereby by-passing contact I'6I of clock |60. This contact |83 closes only when the selector switch |4I is either in the ManuaL Dial or Clear position. This permits the operator to change his program from a previously selected program to a new program simply by moving selector switch |4| of Fig. 1 from the Automatic to the Manual position and selecting the station desired. Meanwhile the timing mechanism continues to function and operate the indexing of disk unit 20 of the memory device for every ve minute, fifteen minute, half hour or hour time interval, depending upon the previously preselected program. The operator can, at any time, switch from the Manual to the Automatic position of selector switch |l|| of Fig. '1, and obtain immediately the previously preselected program that had been desired for that particular time. Having transferred back to the Automatic position the equipment continues to operate automatically, and selects, at the proper time interval, the program preselected previously prior to the switching to the Manual position. Turning the selector switch I4! of Fig. '1 to the Dial position opens contacts |84 to |92, inclusive, and 201 and 2|4, thereby removing the power supply from the signal input system of the memory device and from relays |50, |5|, |52, 203 and 209 thus making the pushbutton stations |03, I I3, II4, |42, |43, and |44 inoperative. Contact |93 closes the speaker circuit. However, the timing It should be noted that the i,

circuits and indexing mechanism of unit of the memory device continue to function and remain under the control of cams and |18. Switching from the Dial to the Automatic position, the equipment will operate and function similarly to the performance outlined above when the operator had switched from the Manual to Automatic position. Operation of the selector switch |4I of Fig. '1 to the Clear position will open contacts |84 to |95, inclusive, and 201 and 2I4 and close contact |96. Closing of contact |96 energizes the clearing circuit which operates as follows: Contact |96 closes, energizing solenoid 55 of the memory device. As the plunger 56 of solenoid 55 begins its stroke it operates contact |14 to close and when the plunger 56 completes its stroke it operates contact |69 to close. When contact |69 closes it energizes relay |19 which closes its contacts |1I and |13 and opens its contact |12. Contact |13 holds relay |10 energized. Contact I1| energizes the release coil |11 of stepper switch |61 so that arm |63 goes to the Off (l) position. When contact |12 opens, it deenergizes solenoid 55 of the memory device, thereby operating the indexing mechanism as previously described. Contact |12 remains open until the plunger 56 of solenoid 55 opens contact |14 (situated at the beginning of the plunger stroke) thereby cle-energizing relay |19 which opens its contacts |1| and |13 and closes its contact |12. When contact |12 closes, solenoid 55 is again energized and the cycle as described above repeats itself. This cycle of indexing continues automatically until all extending pins on unit 20 have been cleared. When all pins have been cleared, the solenoid arm I2 operates a limit switch |91 which automatically de-energizes the indexing mechanism for the disk-unit 20. Limit switch contact |98 closes, and energizes an indicating light |99 to indicate that disk-unit 20 is cleared of all extended pins. Clear switch contact de-energizes the timing circuits during the clearing operation. It should also be noted that when any station is manually or automatically selected il an indicating light |59 indicates the station that has been selected.

A standard start-stop clock mechanism is incorporated in the equipment in such a manner that the equipment may be started or shut-down automatically at any time and yet operate its preselected programs in the sequence originally selected. A timing device such as illustrated in the Robertson Patent 2,096,620 may be employed for this purpose, for example.

It should be noted that turning the selector switch |4| from its Off position to the On position will permit recording the selections on the memory unit 29 even though the radio ciri cuits are shut down. The equipment is also so designed that television or short-wave stations may be manually or automatically selected for predetermined times. This equipment operates just as previously described, except that push ,l button |03 designated Television or Shortcircuit from the radio channel to a television or short-wave channel.

Relays |53, I5I, |52, and 233 could be contacts operated directly by the memory unit pins.

It should be noted that this invention is readily adapted for use in connection with any number of desired stations.

The equipment is also so designed that the phonograph, record player, or other attachment may be manually or automatically operated for predetermined times. The equipment operates just as previously described, except that the additional push button I I3 is added for a phonograph selection. The button |!3 energizes solenoid I4a to operate pin 36a. If, before depressing button II3, a time button |42, |43, or |45 is depressed, the phonograph may be set up for five minutes, a half hour, or one hour operation and when only button II3 is operated the phonograph will play only for fteen minutes. Also contact 2 I 5 of the Phone button energizes the indexing mechanism, previously described for solenoid 42 thereby permitting other selections to be recorded on the memory unit 2G. When pin 30a comes in contact with and closes switch 390 it energizes relay 209, which closes its contacts EII and 2I2 and opens its contact 2I0.

The closing of contact 2II puts the speaker in the phonograph circuit, while contact 2I2 operates the phonograph starting mechanism thereby playing records. The opening of contact 2|0 prevents the radio or television channels from being operated while the phonograph is functioning. The phonograph can be selected for predetermined time playing of records, namely, iive minutes, fteen minutes, half hour, or one hour, etc. The same circuits operate during this timing cycle as operated for the radio or television selections.

Fig. 9 illustrates an arrangement for utilizing a device of the character shown in Figs. 1-5 for the selective opera-tion oi a juke box or other record player. Two sets of push buttons 23 I-235 and 24|-245 are exemplied. rihe former are individual-control buttons whereas the latter are pattern-control buttons. rEhe sets of buttons may be used together as shown, or individual sets may be used, depending on the requirements of a particular case. Operations of the buttons 24I-245 are controlled by a control button 245. There is provided a switch 24? adapted to be operated by the ordinary record-removing mechanism and a relay 248 similar to the relay |45 and controlled by this switch. A coin-controlled Contact 249 is provided for juke-box use. is shown a. pyramid circuit 258 adapted for use in the playing of twenty-four records, A thru X, or the two sides of each of twelve records. Other parts are in general similar to those previously exemplified and are indicated by similar reference numerals. Only five solenoids i4, pins 30, and contact switches 3Q are shown, it being possible either to utilize arms and disks containinfr only this number of elements or to use the construction exactly as shown in Figs. l-5 with the other solenoids, pins, and switches idle.

In operations using buttons 24| thru 245, etc., solenoids I4@ thru I4e are energized directly to push out their corresponding pins 33a thru 30e.

Also these buttons energize the indexing circuit of solenoid arm I2 by energizing relay |45 to close its contacts |46 and I4?. Buttons 23| to 235 may be operated merely by momentary depression, because relay I 45 remains energized thru its contact |46. When contact |47 closes, it energizes sole- As exemplified, there r 12 noid 42, and the plunger at the end of its stroke operates switch |48 to open. The opening of switch |48 de-energizes solenoid 42 and relay I 45 thereby causingr the solenoid arm I2 to index, as previously described.

By pressing Various combinations of the buttons 24| 245, corresponding combinations of solenoids I4a-I4e are energized as previously described. The buttons latch themselves in the closed position. Now the pressing of Release button 246 energizes relay |45 and sets up the indexing cycle of solenoid arm I2, as previously described. Also it trips the latch holding buttons 24I245 permitting these buttons to return to their normal position ready for the selection of a new record or record-side. Button 24B is of the momentarycontact type. The take-ofi switches 39a thru 39e, and their operation of the pyramid relays will be understood from the operations described above.

When the playing of a record is finished, the usual mechanism is actuated to remove the record from the turn-table of the juke-box, and it momentarily operates a switch 241 to close. The closing of this switch energizes a relay 248 similar to relay |45, thereby setting up an indexing cycle identical to that described for solenoid arm I2. When the device indexes, a new group of pins selectively operate switches 39a thru 39e to select a new record or a replaying of the same record as desired.

When the memory unit is completely lled with selections, solenoid arm I2 operates limit switch 20| to energize indicator light 202 which indicates that the memory unit is lled. Clearing the selections may be accomplished as previously described.

The equipment is set in operation when a coin is placed in the juke box, thereby connecting the equipment to the power supply.

As will be appreciated, a wide number of modiiications may be made in the constructions exemplied without departing from the spirit and scope of the invention. For example, the parts which are stationary and the parts which are movable may be varied, so long as general relative movability is maintained. One such modiiication is exemplified in Fig. 10 wherein the solenoids Maz-30h are mounted on a portion 250 of a frame Im, which is otherwise generally similar to the frame I0; and a solenoid 42m, corresponding to the solenoid 42, is likewise mounted on the frame IIlm. A disk unit ZIJ similar in all respects to that shown in Fig, 1 is provided, and above it switches 39o-39h carrying wipers 40u-40h are mounted on an arm 25| which is rotatably carried on a shaft I Im and which carries a solenoid 55m corresponding to the solenoid 55. Arms I8 and 58 and pawl, spr-ing, and pin arrangements are provided as in the case of the construction of Figs. 1-5.

In the form of construction shown in Figs. 11-14 there is provided a frame 3I0 to which a Vertical tubular shaft 3 i I is nxedly secured and registered by a pin SI2. Rotatably mounted on the lower part of the shaft 3II is an indexing disk 3|3 on the periphery of which are ratchet teeth 3| 4. Attached to shaft 3II is a bracket 3|5 on which are spirally mounted a. plurality of solenoids 3I6 having radially movable plungers 3 I I. Eight solenoids designated respectively as 3I6a, 3I6b, 3|6e, SIECI, 3I6e, 3I6f, 3I6g, and 3I6h are provided in the present instance. Around the solenoid assembly SIS is an inner drum 3I9, an outer drum 32D fastened together and to a ring 32| by rivets 322 at the top, and at the bottom the inner drum 3|9 and the outer drum 326 are fastened together and to indexing disk 3| 3 by rivets 323. The drums 3|3 and 320 are formed with alined rows 324 of holes 325. Drum assembly 326 has alined holes 325 which are equally spaced circumferentially ina number of planes. On the inner surface of a drum 321 there are mounted switches 328e, 32811, 328e, 328d, 328e, 3`28f, 328g, and 328h which are also disposed in a number of planes. In this case there are eight planes numbered I, II, III, IV, V, VI, VII, and VIII, with a hundred holes in each plane. In each hole there is a pin 36. Solenoid 3|6a, with its plunger 3|1, wiper 329 and switch 3280!r all lie in plane I, and operate only on the pins in plane I. The corresponding b numbers (3|6b and 328D) all lie in plane II and opcrate only on the pins in plane II. In the same manner the c group correspond to plane III. Each group (a, b, c, d, e, f, y, h) can start at any pin in its plane. pletely cleared each group (a thru h) must be in the start relationship. As shown in Fig. 11 the start relationship is with solenoid, pin and wiper in line, (the circuit arrangement of Fig, 9 with the portion in the upper left hand corner which is set off by dot-and-dash lines replaced by the circuit diagram of Fig. 16)

Although there are one hundred pins in a plane, only ninety-eight can be set at any time, because there are always two pins in the region of the re-set cam or inclined surface 313.

Each pair of holes contains a pin 30, as described previously, which is movable. In each row 324 there are provided in the present instance, eight pins 36 so arranged that the pins of any row may be alined with the plungers 3|1 of the spirally-mounted solenoids 3|6. The pins in a spiral row or set, as shown circled on the expanded view Fig. 15, are in successive planes from I thru VIII and in series da, dk, do, af, aq,

ba, blc and bu respectively. Around the drum assembly 326, is another drum 321 on the inner surface of which are spirally mounted a plurality of switches 328 carrying radially extending cam surfaces 329 of such length that they will contact a pin 30 which is in an outward position, but not a pin 30 which is in an inward position. In the present instance, the switches are so arranged that their cam surfaces 329 will be alined with the circled pins (Fig. 15) of any row which may be i."

brought into position with cam surfaces 329. Above the drum assembly 326 is a movable arm 330 which moves around shaft 3| Above arm 330 is a disk 335, the central portion of which is formed into a tubular section 336, so that the 4 inner surface forms a bearing around the shaft 3|| and the outer surface forms a bearing for the arm 336. On arm 336 a spacer collar 331 is fastened by rivets 338. The peripheral portion of disk. 335 is fastened to the upper flange of drum 321 by detachable fastenings 339. Disk 335 carries a solenoid 340 having a plunger 34| attached to arm 330. Pin 342 is secured to disk 335 and extends downward to form a stop for arm 33D in its clockwise stroke movement relative to drum 321. Pin 343 is attached to disk 335 and extends downward to engage the outer surface of pawl 33|. Arm 333 carrie-s near its outer end a pawl pivoted at 332. A spring 333 serves 'to push the pawl 33| against the notched periphery of the ring and at the same time partially withdraws the plunger 34| from a solenoid 340 and holds arm 330 against a stop 342. The periphery of the ring 32| is Shaped in the form of a ratchet by the provision of sawtooth notches 334. A pin 343 When the drum is com- ,7, mally held in place by a spring 339.

acts as a stop to hold the pawl 33| in a notch 334 and serves to positively prevent the pawl 33| from being moved outwardly until the plunger 34| moves the arm 33|] and the pawl 33| in counterclockwise direction (Fig. 13) relative to the drum assembly 325. Clockwise movement of the unit 326 with respect to outer drum 321 is thus effectively prevented.

There is pivoted at 344 on disk 335 a pawl 345. A spring 346 serves to hold the pawl 345 against the notched periphery of ring 32|. Pins 341 and 34S, attached to disk 335 and extending downwardly, serve as stops to limit the amount of travel of pawl 345. The spring 346, as shown, is a lcompression type spring guided by a central shaft 349 on which is secured a collar 350. One end 35| of shaft 349 is pivoted on pawl 345 while the other end is guided in a lug 353 which is fastened to disk 335. A spring 333, as shown, is a compression-type spring guided by a central shaft 354 on which is secured a collar 355. One end 355 of shaft 354 is pivoted on pawl 33| while the other end is guided in the lug 358 which is fastened to disk 335.

On the top surface of the base of the frame 31S there is mounted a solenoid 359 adapted when energized to draw in a plunger 366 on which is pivoted at 35| a pawl 362. A spring 363 serves to normally hold this pawl 332 in place and to partially withdraw the plunger 360 from solenoid 35S. The outer end 334 of plunger 363 is guided by a. lug 355 which is fastened to the hase of the frame. Lug 335 serves also to limit the outward travel of the plunger 350. The pin fastened to base and extending upward, acts as a stop to hold the pawl 362 against a ratchet tooth 3 d. This pin 366 serves to positively prevent the pawl 352 from being moved outwardly until the plunger 35e carries the pawl 362 towards the solenoid 359. Clockwise movement of disk 3:53 (and the drum assembly 326 attached thereto) with respect to frame 3|@ is thus effectively prevented. rPhere is pivcted at on the upper side of the frame 3m, a pawl 338 which is nor- Pins 310 and 31|, attached to frame 3m and extending upward, serve as stops to limit the amount of travel of pawl 358.

As will be seen from Fig. l1 there are attached *o switch bodies 312 inclined surfaces 313. The outer limit of each inclined surface can contact a radially-extended pin 3f.) and the inner limit the inclined surface can pass a pin 30 which in a radially inward position. During a stepping action of drum 321 relative to drum 326; i. e., for taking off of next signal, the inclined If that pin is an outwardly extended position it will be camineri inwardly thereby and re-set for a new signal, A limit switch 3115 is mounted on disk 335. Limit switches 315 and 31S are mounted on frame 3m.

Lug is fastened to the cuter side of drum 321 and extends outward to actuate switch 316 when drum 331 and base are in the relative position shown in Fig. l1. This occurs only when the device is clear of signals.

Hole 315 in bracket 3|5 and hole 313 in tube shaft 3i! are employed for passage of leads 386 from solenoids 3' 3|ib, 313e, 3|6d, 3|5e, 3|6f,

and 355k. to outside of device.

Collar 33 is a free sliding fit on shaft 3| that holds the entire assembly together and this collar is hel-d in place by snap ring 382.

It should be noted that solenoid 353, Vlug 3.65,

surface will move over a pin 35.

15 pin 366, pawl 368, pins 310 and 31|, etc., fastened on frame 3|3 are so placed that when the parts are in the position shown there will be a circled pin in line with each solenoid 3|a 3|6b, 3|5c, SISd, 3|6e, 3|f, 3I5g, and 3I6h.

Upon the energization of selected ones of the solenoids SIB (e. g. solenoids 3|5b, 3|Gd and 3|Se) the plungers 3 1 thereof will be radially extended outward and will move corresponding pins 30dlc, SDaf and 39m] which are directly in line with the plungers. At the completion of the incoming signal the selected solenoids SIB are dre-energized and the solenoid 359 is energized to cause a stepping or indexing of the drum assembly 325 with respect to frame SIG. This results from the movement of the plunger 389 against the pawl 362 in a d' `ection which will stretch spring 363. The pawl 362 is carried from one notch to the next. During this action the disk 3| 3 is prevented from moving in a counterclockwise direction relative to the frame 3|3 by the holding pawl 333. When the solenoid 353 is de-energized, the spring 363 pulls the plunger 359 and the pawl 362 together until the stop 355 contacts the plunger 359. During this action the pawl 358 ratchets to next tooth 3 I4. The pin 356 now serves to hold the pawl 362 in place and to lock disk 3|3 and the frame 3|!) together. rlhis completes an index cycle of drum assembly 325, and the selector means is ready to receive another coded signal or pattern of signals. These can be put in at any time after the row of pins has been positioned, and until the drum assembly 325 is filled with signal patterns.

Signals may be taken off either after or during the putting in of signals and until all the signals which have been put in are taken o. In taking off of signals the cam surfaces 329 serve to operate the switches 328a, 32813, 328e, 328d, 328e, 328i, 328g, and 3287i, wherever there are pins 38 in a radially extended position. After a signal has been picked off and sent out, the taking olf of the next signal is initiated by the energization of solenoid 340 to move an arm 333 in a counterclockwise position (Fig. 13) to index the pawl 33| one notch 334 against the spring 333 to move the arm 33) in a new position with respect to the ring 32|. During this action, solenoid 343 and arm 33|] are drawn together and disk 335 tends to rotate in a clockwise direction since solenoid 340 is attached to disk 335. Disk 335 is prevented from moving in a clockwise direction by pawl 345 and pins 341 and 348 hence arm 33D must move one notch 334 in a. counterclockwise direction thereby compressing spring 333. the solenoid 343 is cle-energized, spring 333 pushes the drum 321 in a counterclockwise direction until stop pin 342 contacts the arm 33D, thus indexing the drum 321 in a counterclockwise direction. This may be repeated as often as desired as long as settings have been imparted to a sufcient number of rows of the pins 30.

It can be seen that when indexing occurs for drum 326 for input of signals and no signals are being taken oif, the drum 321, as well as the arm 330 and its related stepping mechanism are carried along with the drum 32B. This locking feature is provided by pawl 33| in conjunction with pin 343, as previously described.

Instead of round holes, elongated holes having about the same width as a pin are advantageous in certain instances. One such hole 25p is shown in Fig. 17.

The invention in its broader aspects contemplates the use of a wide variety of structural When 16 variations in the memory devices employed. In Fig. 18 there is provided a frame 4|0 comprising a base 4I|, a support 4|2, and a top plate 4|3. The frame rotatably carries a hollow central shaft 4| 4 the body or which is rectangular in cross section, and at the bottom of which is a plug 4I5 having a rounded lower end 4|'I tting into a hole 4|8 in the base 4| I. The upper end of the shaft is provided with a collar 4 I 9 rotatably set in a circular opening 42| in the top plate 4 I3. The shaft carries switch arms 424 of which eight, indicated 424er, 424e 4241i, are utilized in the present instance. These switch arms are made of non-conducting material and are adapted to be interchangeably slid on the shaft in assembly to rotate with the shaft. Wipers 425e, 4251) 4257i are resiliently mounted on arms 424a, 424|) 42411. by rivets 425. At the riveted end 421 of each wiper 425 an insulated wire 428 is securely fastened. Wiring leads 428 run from the wipers 425a, 425i) 42571 upwardly thru the hollow shaft 4|4. The wipers are arranged to make contact with one of a number of xed contacts 429. Contacts 429 are circumferentially mounted and secured to disks 43Ua, 436i) 430k which are made of insulating material. Radially outward from each of contacts 429 there is mounted a slidable element 43| which is guided in its motion by parts 432. Slidable element 43| also slides on and makes contact with a disk ring 433. The outer edge 434 of disk ring 433 is formed into a spacer ring, being ared out with a flange 435. Clearance holes 43B are cut into disk ring 433 and its outer edge 434 in such a manner to permit slidable elements to pass freely. Part 431 keeps the sliding element 43| in non-operative position until the element 43| is pushed over part 431 by means to be described later. Part 43| is also prevented from being pushed into the path of wiper 425 of switch arm 424 since its tip strikes against the spacer ring 434 of disk ring 433.

Attached to support 4|2 are a plurality of solenoids 439 having radially movable plungers 440. Three are shown in the present instance. The plungers 440 are alined with a sliding element 43| so that when the solenoid 439 is energized the plunger 440 pushes the element 43| radially inward to make contact with fixed contact 429. Springs 44| attached to plungers 44|) and to support 4|2, act to return the plungers to their normal position after the solenoids 439 are de-energized. Brushes 442 are mounted on support 4|2 and insulated therefrom by insulating parts 443. The brushes are held in place by rivet 444. The outer end of rivet 444 has rmly secured thereto a flexible connector 445. Each brush 442 contacts one of spacer rings 434. Each iiange 435 is secured to the previous insulating disk 430 at points 445 between sliding elements 43| so that there is no electrical connection between the parts 433. The assembly of these units 441 comprising insulating disks 43M, 43017 4301i and 435 form a combination disk and drum type of memory device.

At the bottom between disk 430k and the base 4|I is an indexing disk 448. Disk 448 is secured to disk 4307i by fastening devices 449, and properly spaced from 4307i by spacing rings 450 and 45|. On the periphery of disk 448 are ratchet teeth 452. On the top surface of base 4|| there is mounted a solenoid 453 adapted, when energized, to draw in a plunger 454 on which is pivoted at 455 a pawl 456. A spring 451 serves to normally hold this pawl 456 in place 17 and to partially Withdraw the plunger 454 from solenoid 453. The outer end 458 of plunger 454 is guided by a lug 459 which is fastened to base 41 I. Lug 459 serves also to limit the out ward travel of the plunger 454. A pi-n 460, fasened to base 411 and extending upward, acts as a stop to hold the pawl 456 against a ratchet tooth 452. This pin 460 serves to positively prevent the pawl 455 from being moved outwardly until the plunger 454 carries the pawl 456 towards the solenoid 453. `Clockwise movement yof disk 448 (and of disk-drum unit 441 attached thereto) with respect to base 41 1 is thus effectively prevented. There is pivoted at 46.1, on the upper side of 411, a pawl 462 which is normally l held in place by a spring 463. Pins `464 and 465., attached to base 411 and extending upward, serve as stops to limit the amount of travel of pawl 462. In the center of indexing disk 448 is a hole 466 the inner surface 461 of which can rotate around the collar-like portion 468 of 424k.. This forms a bearing for the lower end of the drum-disk unit 4:11.

On the central shaft 414 and between switch arm 424e and collar 419 is the indexing disk Y,

469 on the periphery of which are the ratchet teeth 419. Since this disk 469 i-s placed on the rectangular section shaft 414, the disk 469, shaft 414 and arms 424s, 4241:' 42411. will rotate together. 41| which is secured to the flange 435e and insulated therefrom by a spacer ring 412. The inner portion 418 of plate 411 is bent upward to form a bearing surface 414 around the collar 419. The flange 415 rides against the under surface of top plate 419. On the top surface of plate 411 there is mounted a solenoid 416 adapted when energized to draw ina plunger 411 on which is pivoted at 418 a pawl 419. A spring 480 serves normally to hold this pawl 419 in place and to partially withdraw the plunger 411 from solenoid 416. The outer end 481 of plunger 411 is ,guided by a lug 482 which is fastened to plate 411. Lug 462 serves also to limit the outward travel of the plunger 411. The guide 483 fastened to lug 482 and extending toward the pawl 419 acts as a stop to hold pawl 419 against a ratchet tooth 419. This guide 483 serves vto positively prevent the pawl 419 from being moved outwardly until the plunger 411 carries the pawl 419 to- Wards the solenoid 416. Counterclockwise movement of indexing disk 469 with respect to plate 411 is thus effectively prevented. There is pivoted at 484, on the under side of plate 411, a pawl 485 which is normally held in place by a spring 496. Pins 481 and 488, attached to plate 41| and extending downward, serve as stops to lil-nit the amount oi travel of pawl 485.

In order to clear the settings. cam arms 489 are provided to act against the inner portions 499 of elements 431. When a switch arm 424 steps, the cam action pushes an inwardly extended element 431 in a radially outward .direction, thereby resetting the element 431 ,for a new signal. This action occurs only during the step ping of a switch arm 428 and only upon that element 431 from which it is stepping.

Upon the energization of selected ones of the solenoids 439er, 43911 4397i the plungers 449 thereof will be radially extended inward and will move corresponding slidable elements 431 which are directly in line with the plungers. .At the completion of the 'incoming signal the selected solenoids 439 are de-energized and the solenoid 453 is energized to cause ka stepping or Above indexing disk 469 is the plate ,Y

indexing of the drum-disk assembly unit 441 with respect to base 411. This results from the movement of the plunger 454 carrying the pawl 456 and stretching the spring 451. The pawl 456 'is carried from one tooth 452 to the next. During this action the disk 448 is prevented from moving in a counterclockwise direction relative to base 411 by the holding pawl 462. When the solenoid 453 is de-energized, the spring 451 pulls the plunger 454 and the paw1456 together until the -lug 459 contacts the plunger 454. During this action the pawl 462 ratchets to the next tooth 452. The pin 460 now serves to hold the pawl 456 in place and to lock disk 448 and the base 411 together. This completes an index cycle of drum-*disk assembly 441, and the selector means is ready to receive another coded signal or pattern of signals. These can be put in until the drum-disk assembly unit 441 has rotated thru 360; or, at any time after the sliding elements have been positioned.

Signals may be taken 01T either after or during the putting in of signals and until all the .signals which have been put in are taken off. In the taking 01T of signals the wiper 425a, 42517, 42511, in contact with contact 429 serves to complete `the circuit Wherever there are slidable elements 43.1 in a radially inward position against contact 429. Otherwise the circuit is open. The taking off of the next signal is initiated by the energization of solenoid 416 to move arms 424m, 424b 42411 in a counterclockwise direction (Fig. 199. When the signal comes for the stepping of the Wiper arms 424a, 42417` 424k to the next pattern of Vsignals stored in the memory unit, solenoid 416 is energized to cause a stepping or indexing of the central shaft 414 with respect to plate 411. This results from the movemen-t of the plunger 411 carrying the pawl 419 and stretching the spring 480. The pawl 419 is carried from one tooth 410 to the next. During this action the disk 469 is prevented from moving in a clockwise direction relative to the plate 411 by the holding pawl 485. When the solenoid 416 is (le-energized, the spring 419 pulls the plunger 411 and the pawl 419 together until the lug 482 contacts the plunger 411. During this action the pawl 485 ratchets to the next tooth 410. The guide 483 now serves to hold the pawl 419 in place and to lock disk 469 and the plate 411 together. This completes an index cycle of the central shaft 414, and the selector means is ready to take oft' another coded signal or pattern of signals. These can be taken off until the central shaft 414 has rotated thru 360; or, at any time prior to making a complete rotation.

As will be appreciated the invention is readily adaptable to continuous operation in a single direction. To this end there is provided in the present instance a slip-ring unit 491 on the upper end of the shaft 414. The slip-ring unit 491 comprises an insulating body 492 and carries slip rings 493, to which the ends of leads 428 are connected. Insulating arm 494 mounted on the top plate 413 carries Wiper arms 495 contacting slip rings 493 from which conductors 496 lead off.

It Vis also desirable that the signals which are put into -a series of rows be repeatable, and to this end the device of Figs. 18-2() embodies means whereby the clearing cam 489 may be retracted to an inoperative position when desired. The cam 489 is urged rearwardly by springs 491 against the surface of a vertical plunger 498 which .is formed with recesses 499 and cam surfaces 500 beneath the recesses. At the upper end of the plunger 498 is a knob 50| notched at 502 and 503 for the reception of a spring-pressed detent 504 when the knob 50| is in its uppermost position, as shown in full lines in Fig. 18, the clearing cams 489 are all held outwardly as shown in Fig. 18, and in full lines in Fig. 19. In this position the cam 489 operates to clear at each revolution. However, when the notch 50| and the plunger 498 are in their lowermost position the notches 499 are in line with the inner ends 505 of the cam arms 489 so that the cam arms 489 may be drawn inwardly by the springs 491. When further repetition becomes undesirable, the notch 50| is pulled inwardly with the result that the cams 489 are thrust outwardly by the cam surfaces 500. The plunger 498 forms a unit with the shaft 4|4 in the rotation thereof being held firmly therein by insulating plates 506.

In the form of construction shown in Fig. 21 there is provided a frame 5|0 to which a vertical shaft 5I| is fixedly secured. Rotatably mounted on the lower part of the shaft 5|| is a supporting arm 5|2 carrying a plurality of magnetizing units 5|4. designated respectively as 5I4a, 5|4b, 5|4c, 5|4d, 5|4e, 5|4f, 5|4g, and 5|4h are provided in the present instance. Above the supporting arm 5|'2 is an indexing arm 5|8 which is rotatably mounted on the shaft 5|| independently of the arm 5|2. Above the arm 5|8 is a memory unit 520, which is composed of a ring 52| and a ribbed disk unit 522 fastened together by fastening device 523, rotatably mounted on the shaft 5I| and is freely movable with respect to the arms 5|2 and 5|8. Fastened to the ribbed disk 522 by device 524 is a disk 525 composed of nonmagnetic material coated with magnetic recording media 528 of any of the various types commonly used for the imposition of reversible alteration of magnetic qualities of portions thereof. On the upper portion of the frame 5|0 are a plurality of pickups 539 carrying downwardlyextending pick-up heads 540 which are close enough to the magnetic media 526 so that these heads 540 will be influenced by any changes of the magnetic characteristics of the magnetic media 526.

The arm 5|2 carries near its outer end a solenoid 542 having a plunger' 543 adapted to bear against the outer end of the arm 5|8. The periphery of the ring 52| is shaped in the form of a ratchet by the provision of saw-tooth notches 545, and there is pivoted at 546 on the arm 5|2 a pawl 541 held against the periphery of the ring 52| by a spring 548. Pivoted on the arm 5|8 at 549 is a pawl 550. A spring 55| serves to pull the pawl 550 against the notched periphery of the ring 52|, and at the same time to draw the pawl and the arm 518 toward the end of the plunger 543. A pin 553 acts as a stop for such movement, and a pin 554 serves to positively prevent the pawl 550 from being moved outwardly until the plunger 543 moves the arm 5I8 and the pawl in a counterclockwise direction (Fig. 22) relative to the ring 52|. Clockwise movement of the unit 520 with respect to the arm 5|2 is thus effectively prevented.

On the underside of the upper portion of the frame 5| 0 there is mounted a solenoid 555 adapted when energized to draw in a plunger 556 which is connected by a link 551 to an arm 558 which is rotatably mounted on the shaft 5I|. The periphery of the disk 522 is notched as at 565, and there is pivoted at 566 on the underside of Eight magnetizing units 20 the upper portion of the frame 5|0 a pawl 561 which is normally held in place by a spring 560. Pivotally mounted at 569 on the arm 558 is a pawl 510, and a spring 51| serves to normally hold this pawl in place and to draw the arm away from the solenoid 565, a stop pin 513 being provided to limit this movement. A pin 514 serves to hold the pawl 510 in place and prevent any movement of the unit 520 until the arm 558 and the pawl 510 are moved in a counterclockwise direction (Fig. 23).

Mounted on arm 558 is a magnetizing unit 515 (Figs. 23 and 25) having a member 516 which will so affect the magnetic media 526 directly beneath it in such a manner as to restore that portion of' the magnetic media 526 to a neutral condition. In this manner, any signals that are recorded can therefore be cancelled (erased, neutralized) and that cleared portion of the magnetic media 526 is now readied for recording a new signal pattern.

Upon the energization of selected ones of the magnetizing units 5|4 (e. g. magnetizing units 5|4b, 5|4d, and 5|4e) the magnetic field produced thereby will affect the magnetic media 526 in such a way as to leave an impression of the energizing magnetic field at that point. At the completion of the incoming signal the selected magnetizing units 5|4 are de-energized and the solenoid 542 is energized to cause a stepping or "indexing of the unit 520 with respect to the arm 5|2. This results from the movement of the plunger 543 against the arm 5|B in a direction `which will stretch the spring The arm 5|8 is moved enough to carry the pawl 550 in a counterclockwise direction (Fig. 22) from one notch to the next. During this action the supporting arm 5|2 is prevented from moving in a clockwise direction relative to the ring 52| by the holding pawl 541. When the solenoid 542 is de-energized, the spring 55| pulls the arm 5|2 and the arm 5|8 together until stop 553 contacts the arm 5|8. During this action the pawl 541 ratchets to the next notch 545. The pin 554 now serves to hold the pawl 550 in place and to lock the arm 5|2 and ring 52| together. This completes an index cycle of the arm 5|2 and the preselector means is ready to receive another coded signal or pattern of signals. These can be put in until the arm 5|2 has rotated thru 340, or in any time after a row of magnetic media 526 has been positioned.

Signals may be taken off either after or simultaneously with the putting in of signals and until all the signals which have been put in are taken off. In the taking off of signals (Figs. 2l and 24) the pick-up head 540 is influenced by the impressed field in the magnetic media 526 (originally set-up by the input magnetizing units 5|4, as previously described) in such a manner that the impedance of the pick-up head coil 54| is changed. This impedance change or impedance differential is reflected or sensed by an electronic means, as well-known to the electronic art. The output from the electronic means operates the selective relays (580, 58|, 582 etc., Fig. 24) in the usual manner to duplicate the pattern that was put in and recorded. Such points of the magnetic media 526 as were not altered by the magnetizing units 5| 4 (since these magnetizing units 5|4 were not energized for this particular signal pattern) the impedance of the pick-up head coil 54| remains unchanged and hence no signal is reflected back to the electronic sensing and amplifying unit thereby 

